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Trigonometry

Trigonometry. (Continued). C A H. S O H. T O A. What we know already!. O means theta. Hyp. opp. O. Adj. Find the missing length. Sin O = opposite hypotenuse Sin 30º = Y 15 0.5 = y 15 0.5 x 15 = Y Y = 7.5. 15. Y. 30°.

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Trigonometry

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  1. Trigonometry (Continued)

  2. C A H S O H T O A

  3. What we know already! O means theta Hyp opp O Adj

  4. Find the missing length Sin O = opposite hypotenuse Sin 30º = Y 15 0.5 = y 15 0.5 x 15 = Y Y = 7.5 15 Y 30°

  5. Finding angles when you know the lengths

  6. What if we know the length and want to find the angle? 14cm Tan O = opposite adjacent Tan O = 14 17 Tan O = 0.8235 Angle O = inv tan 0.8235 Angle O = 39.47º O 17cm

  7. Using the inverse button on your calculator, work out the following angles 1) Sin = 0.6421 6) Sin = 0.8624 7) Tan = 0.5724 2) Cos = 0.7254 = 0.2125 8) Sin = 0.8 3) Tan 9) Cos = 0. 9847 4) Cos = 0.9564 5) Tan = 0.5 10) Tan = 0.7464

  8. Y A 12 AC X 12 20 C B B 25 B A BC C 6.2 X A B 25 X 42º 9 12º 8 C 35º Y D 60 12 33º 35º Y E 20º 28 25 A Please copy the diagrams and find the missing lengths 5 1 30º 30 2 6 40º 70º 3 50 7 23º 30º 4 6.5 8 45º 40º

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